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Some of topics included in this course are: Fundamentals of Acoustics, Levels and Decibels, Divergence and Directivity, Hearing, Human Response to Noise, Frequency Analysis, Sound Sources and Fields, Room Acoustics, Sound Power, Noise Barriers, Outdoor Sound Propagation, Helmholtz Resonator and Vibration Control. Key points of this lab manual are: Acoustic Materials, Nc Rating of Rooms, Acoustic Materials and Nc Rating of Rooms, Coefficients of Porous Materials, Room Noise Criteria, Reporting Re
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Material: Freq Hz Lp (^) max Lp (^) min D 1 D 2 αn Z/ρc αstat Published value of α 125 250 500 1000 2000
Material: Freq Hz Lp (^) max Lp (^) min D 1 D 2 αn Z/ρc αstat Published value of α 125 250 500 1000 2000
αn=
Z/ρc=
αstat=
Center Freq (Hz) A B C 32 64 125 250 500 1000 2000 4000 8000 overall NC rating Recommended NC rating (ASHRAE)